DRV81646
- Four-channel integrated low-side
switches
- 140mΩ RDS(ON) at 25°C
- Operating supply voltage range: 4.5V to 65V (70V absolute maximum)
- Selectable current limit from 0.5A up to 4A per channel
- Fast PWM switching up to 500kHz
- Flexible interface options:
- Hardware interface with independent channel PWM input
- SPI enables reduction in GPIO and isolation overhead for high channel count designs
- Integrated catch diodes for flexible decay modes with optional external TVS/Zener diode as alternate current path on switch turnoff
- Slew rate configurable (100ns – 1500ns) enables both slow/fast switching applications
- Diagnostic feedback
- MCU fault interrupt signal (nFAULT)
- Per channel fault report available through SPI
- Protection Features
- User settable current limit
- Independent overtemperature and overcurrent protection for each channel
- Configurable overcurrent cut-off delay (COD) 0.5ms-2ms
The DRV81646 is a four-channel low-side switch driver that operates from 4.5V to 65V and supports a wide range of load currents. The device integrates four low-side switches with a RDS(ON) of 140mΩ, each with a freewheeling diode to the VCLAMP pin. This feature allows the user to either recirculate current or connect an external TVS for inductive load turn-off.
The device can be controlled through a hardware GPIO interface or standard 4-wire SPI. Each channel features individual overtemperature protection, and an analog current limit adjustable with an external resistor on the ILIM pin. There is an optional cut-off delay (COD) configuration which limits the duration of a current-limiting condition on the respective channel, helping to prevent damage to the device or the load. The output slew rates are configurable by setting a resistor on the RSLEW/CNTL pin, providing further flexibility in the control of the output switches. The device has an INRUSH mode boosting the current limit threshold for capacitive loads.
The DRV81646 provides a fault output pin (nFAULT) to indicate fault conditions, and per-channel fault status can be monitored in SPI mode. This feature allows the user to quickly identify and respond to any faults that occur.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | DRV81646 : 65V Four-Channel Low-side Driver with Hardware, SPI, and Configurable Slew Rate and Cut-off Duration datasheet (Rev. A) | PDF | HTML | 2025/12/10 | ||
| 證書 | DRV81646EVM EU Declaration of Conformity (DoC) | 2025/10/22 | ||||
| 白皮書 | 軟體定義車輛將汽車電子的未來推入正軌 (Rev. B) | PDF | HTML | Download English Version (Rev.B) | PDF | HTML | 2025/1/29 |
設計與開發
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DRV81646DGQEVM — DRV81646 評估模組（DGQ 封裝）
DRV81646EVM — DRV81646 評估模組
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| HTSSOP (PWP) | 20 | Ultra Librarian |
| HVSSOP (DGQ) | 24 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。